Can I buy my Friends and Family Tickets on the door? Unfortunately not, these have to be purchased in advance. For more information, please visit the Merlin Annual Pass website. Related articles How do I purchase friends and family tickets for SEA LIFE London? Where can I purchase my tickets? Do you offer any concessionary rates? Can I pre-book my visit with a Merlin Annual Pass? Do you offer a Merlin Annual Pass where you can pay in monthly instalments?